Pressurized gas insulated switching installation

ABSTRACT

In a pressurized gas insulated switching installation having two branches that can be coupled, through power switches, with a type of bus-bar two-part ring-bar, the two parts of the ring-bar are connected with three power switches connected in series, and between the power switches the connection points for the branches are situated. The poles of the three power switches belonging to one phase are disposed in one common vertical plane and two horizontal planes.

Appl. No.: 279,394

Foreign Application Priority Data Sept. 29, 1971 Germany P 21 49 287.5

I Umted States Patent 1 {111 3,777,083

Olson et al. Dec. 4, 1973 PRESSURIZED GAS INSULATED [56] ReferencesCited SWITCHING INSTALLATION UNITED STATES PATENTS [75] Inventors: WilliOlson; Klaus Schlosser, both of 3,248,611 4/1966 Wilcox 200/48 R Berlin,Germany Primary Examinerl-lerman J. Hohauser 73 A S Akti ll haft, M h,

[ ssignee (52:2 :1 engese Sc umc AztorneyHugh A. Chapm In a pressurizedgas insulated switching installation having two branches that can becoupled, through power switches, with a type of bus-bar two-partringbar, the two parts of the ring-bar are connected with three powerswitches connected in series, and between the power switches theconnection points for the branches are situated. The poles of the threepower switches belonging to one phase are disposed in one commonvertical plane and two horizontal planes.

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PR'ESSURIZED GAS INSULATED SWITCHING INSTALLATION BACKGROUND OF THEINVENTION 1. Field of the Invention The invention relates in general toelectrical switching installations and more particularly to apressurized gas insulated switching installation.

' 2. Description of the Prior Art In British Pat. No. 505,638 ametal-encapsulated switching installation, filled with an insulatingmedium,

is shown. In this case gas under pressure may also be regarded as aninsulating medium. This switching installation comprises one two-partring-bar, to which a number of individual or common branches can becoupled. Each branch is thereby switched through the intermediary of apower switch associated with it. In the event that a power switch fails,current stops in its associated branch, and it cannot be aided bysupplying energy from another branch.

On the other'hand, in a switching installation having two power switchesper branch reliability is increased.

In the event of failure of one power switch, theassociated branch can beconnected to the bus bar through the intermediary of the second powerswitch, and thus be supplied with energy.

SUMMARY OF THE INVENTION The invention is concerned with a switchinginstalla tion, insulated by pressurized gas and having two branches thatcan be coupled, through the intermediary of power switches, with a typeof bus-bar two-part ring-bar. Here the ring-bar is part of acurrentsupplying network. In this application, while increasedreliability is obtained, there is a problem of keeping the cost ofoperating means small. In addition, an appropriate compact constructionfor the switching installation should be obtained. In accordance withthe invention, the two parts of the ring-bar are connected with threepower switches electrically connected in series. Between the switchesthe connection points of the branches are located. Furthermore the polesof the three power switches belonging to one phase are disposed in onecommon vertical plane and in two horizontal planes.

By means of the invention the operational reliability ofthe'installation is increased, since in the event of failure of onepower switch, the branch becoming currentless can, through theintermediary of a second power switch, be supplied with energy. Theexpense hereby is advantageously smaller than in the case ofcollectorbar systems having two power switches per branch, because withthe installation of the invention only 1.5 power switches per branch areused.

Moreover optimum bulk is obtained through the arrangement of the threepower-switch poles in one common vertical plane and two superposedhorizontal planes. It is possible to build up narrow sections, whoselengths are determined chiefly by two power switches and the associatedaggregate, e.g., disconnecting switches, grounding switches, voltage andcurrent transformers and the like. Aparticularly favorable arrangementresults when two'power switches-are disposed in the upper horizontalplane and-one power switch is disposed in the lower horizontal plane.Here the poles of the power switches in the upper horizontal planeare-advantageously disposed so that they canbe removed in an upwarddirection for replacement, while the pole of the power switch disposedin the lower plane can be removed in a downward direction forreplacement. The design height of a section above the ground can bedecreased if the power switch situated in the lower horizontal plane isdisposed in a special recess on the ground side.

One advantageous utilization of space in the case of a plurality ofsections can be obtained when the two parts of the ring-bar are disposedspatially between the two connections of the individual power switchessituated in one horizontal plane.

BRIEF DESCRIPTION OF THE DRAWINGS One example of the constructionembodying the invention, in the switching installation insulated bypressurized gas, is described by reference to the drawings in which:

FIG. 1 shows a circuit diagram for a gas-insulated switchinginstallation; and

FIG. 2 illustrates the gas-insulated switching installation with onesection.

- DESCRIPTION OF THE PREFERRED EMBODIMENT The circuit diagram of FIG. 1shows two portions 1 and 2 of a type of bus-bar ring-bar, connected to acurrent-supplying network and having the three sections 3, 4 and 5 incommon. In section 3 the two portions 1, and 2 of the ring-bar areelectrically connected together through the intermediary of three powerswitches 6, 7 and 8, whereby each of the power switches 6 to 8 isassociated .with two disconnecting switches 6a, 6b; 7a, 7b; and 8a, 8b.Each section of the pressurized gas insulated switching installation, inaccordance with the invention, is comprised of two branches 9, 10, whichare connected between the power switches 6, 7, and 7, 8 respectively.Along each branch 9 or 10 current transformers ll, voltage transformersl2, overvoltage limiters l3 and chokes 14 are provided. The overvoltagelimiter 13 and the choke 14 can be switched out through disconnectswitches 15. Furthermore, each of the power switches 6 to 8, and each ofthe branches 9 and 10, is equipped with grounding switches 19, for thepurpose of insuring safe operation of the electrical parts of thegas-insulated switching installation.

The switching installation schmatically shown in FIG. 2, insulated bypressurized gas, has parts similar to those of FIG. 1 and they areindicated by same reference numerals. This installation comprises thepoles of the power switches 6, 7 and 8, belonging to one phase of theS-phase system, in one common vertical plane, corresponding to the planeof the sheet of the drawing. As can be seen, the power switches 6, 8,are disposed in an upper horizontal plane, and the power switch 7 isdisposed in a lower horizontal plane. The poles of the power switchesarehere made with a definitely elongated longitudinal axis or stem andare horizontally disposed. These lengthwise stems belong both in theverti- -cal and the horizontal planes. The power switches 6, 8,

can be upwardly removed for inspection or replacement work; while thepower switch 7 is arranged to be downwardly removed. In accordance withthe invention in order to limit the height of the switching installationabove the ground, the power switch 7 is set in a recess 16 on the groundside. The two parts 1, 2 of the type of bus-bar-ring-bar are spatiallylocated between the two connections l7, 18, or the power switch 7situated in the lower horizontal plane.

The switching installation of the invention, insulated by a pressurizedgas, such as SP is characterized by narrow sections of small length, sothat a smaller area is needed in comparison to conventional switchinginstallations. Through the arrangement of L power switches per branchapproximately the same operational reliability is obtained as withcollector-bar systems having two power switches per branch, whereby thecost of the operating means is decreased.

In the foregoing, the invention has been described in reference tospecific exemplary embodiments. It will be evident, however, thatvariations and modifications, as well as the subsitution of equivalentconstructions and arrangements for those shown for illustration, may bemade without departing from the broader scope and spirit of theinvention as set forth in the appended claims. The specification anddrawings are accordingly to be regarded in an illustrative rather thanin a restrictive sense.

What is claimed is:

l. A pressurized gas insulated switching installation, adapted forcoupling, through the intermediary of power switches, to a type ofbus-bar two-part ring-bar, comprising three electrical power switchesserially connected between the two parts of the ring-bar, two electricalbranch circuits connected at connection points located between theswitches such that the poles of the three power switches are disposed ina common vertical plane and in two horizontal planes.

2. A pressurized gas insulated switching installation, in accordancewith claim 1, in which two power switches are disposed in an upperhorizontal plane, and one power switch is disposed in a lower horizontalplane.

3. A pressurized gas insulated switching installation, in accordancewith claim 2, in which the poles of the power switches, disposed in theupper horizontal plane, can be upwardly removed.

4. A pressurized gas insulated switching installation, in accordancewith claim 2, in which the pole of the power switch disposed in thelower plane can be downwardly removed.

5. A pressurized gas insulated switching installation, in accordancewith claim 4, in which the power switch located in the lower horizontalplane is disposed in a recess at the ground side.

6. A pressurized gas insulated switching installation, in accordancewith claim 5, in which the two portions of the ring-bar are spatiallylocated between the two connections of the power switches individuallylocated in one horizontal plane.

1. A pressurized gas insulated switching installation, adapted forcoupling, through the intermediary of power switches, to a type ofbus-bar two-part ring-bar, comprising three electrical power switchesserially connected between the two parts of the ring-bar, two electricalbranch circuits connected at connection points located between theswitches such that the poles of the three power switches are disposed ina common vertical plane and in two horizontal planes.
 2. A pressurizedgas insulated switching installation, in accordance with claim 1, inwhich two power switches are disposed in an upper horizontal plane, andone power switch is disposed in a lower horizontal plane.
 3. Apressurized gas insulated switching installation, in accordance withclaim 2, in which the poles of the power switches, disposed in the upperhorizontal plane, can be upwardly removed.
 4. A pressurized gasinsulated switching installation, in accordance with claim 2, in whichthe pole of the power switch disposed in the lower plane can bedownwardly removed.
 5. A pressurized gas insulated switchinginstallation, in accordance with claim 4, in which the power switchlocated in the lower horizontal plane is disposed in a recess at theground side.
 6. A pressurized gas insulated switching installation, inaccordance with claim 5, in which the two portions of the ring-bar arespatially located between the two connections of the power switchesindividually located in one horizontal plane.